Alexandee h



(No Model.)

A. H. HANDLAN, Jr.

LIFTING JACK.

Patented-Mar. 17,1885.

Znvezztazv M N. 2% 4 (W UNITED STATES PATENT OFFICE.

ALEXANDER H. HANDLAN, JR, OF ST. LOUIS, MISSOURI.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent lN'o. 313,935, dated March 17, 1885.

Application filed December 9,1584. (X0 model.)

To all whom it may concern.-

Be it known that I, ALEXANDER H. HAND- LAN, J r., of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Lifting-Jacks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which- Figurel is afront elevation of my improved jack. Fig. 2 is a side view. Fig. 3 is a top view. Fig. 4 is a longitudinal section of the body taken on line 4 4, Fig. 3, showing the screw and plunger in side view. Fig. 5 is a transverse section taken on line 5 5, Fig. 4.

My invention relates to those lifting-jacks having a registerto indicate the amount lifted; and my invention consists in the construction fully described hereinafter, and pointed out in the claims.

Referring to the drawings, A represents the body, and B the screw, of alifting-jack. The former is hollow and acts as a cylinder to a plunger or piston, O, that fits snugly therein, and with which the screw has threaded connection.

D represents a register, of any well known form or construction, and I a port or passage way forming a communication between the register and the lower part of the cylinder or body of the jack, which is supplied with a suitable liquid, as shown in Fig. 4. The port is preferably provided with a valve, J.

\Vhen the jack is used,the plungeris forced downward, displacing the liquid beneath it by forcing it through the port or passage-way into the register, and thus the amount lifted or the strain brought to bear upon the jack is indicated by the register.

By removing the cap L of the body, the plunger may be taken out to supply the liquid; or the liquid may be supplied by removing a screw plug, 0. (See Fig. 4.) The plunger has a packing, M, on its lower end.

I claim as my invention 1. ln a liftingjack, the combination of the body, screw. plunger, and register, the latter being connected to the former by means of a port for the passage of liquid displaced by the plunger, substantially as set forth.

2. The combination of a lifting'jack and register, arranged as described, that the latter will indicate the amount lifted by the former through means of liquid forced from the former to the latter, as specified.

ALEXANDER H. HANDLr N, JR.

In presence of GEO. H. KNIGHT, SAML. KNIGHT. 

